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THANK YOU VERY MUCH!!! I forgot to say thank you for this answer the other night.

There are 900 of those counting numbers with no restriction.

Let's find all those that DON'T have a 2 in them

there are 8 possible in the left spot , (no 2 or 0)
but 9 anywhere else
number of counting numbers with NO 2 in them is
8x9x9 = 648

So 900 - 648 or 252 of them have at least one 2 in them.


13 years ago

Answers

Reiny
You are welcome
13 years ago

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